7 is an 80-foot high sculpture built by American artist and sculptor Richard Serra and located in the Museum of Islamic Art Park, in Doha, Qatar. Unveiled in December 2011, it is the tallest public art piece in Qatar and the tallest Richard Serra has ever conceived. It is also his first sculpture to be showcased in the Middle East. Constructed from seven steel plates arranged in a heptagonal shape, the work celebrates the scientific and spiritual significance of the number seven in Islamic culture. It rests on a man-made plaza extending 250 feet (76 metres) into Doha harbour.